Transcript for Search for Answers Following Deadly Roller Coaster Fall

from a roller coaster in texas. Her family on the ride with her. And tonight, her heartbroken son is now weighing in on the accident. Clayton sandell is in arlington, texas. Reporter: Tonight, a search for answers about how a day at this texas amusement park turned deadly. At six flags over texas friday, rosy esparza was riding the texas giant for the first time when she fell to her death. Her son was on the ride, too. He was like, let me down there, I need to go down there and find my mom. Reporter: On facebook, her son calls losing his mother a nightmare. Inspections for amusement park rides vary state to state. And with no sign of foul play, if texas, it's up to six flags to get to the bottom of rosy esparza's death. Some safety experts want independent investigations. So we'll know the true findings, not just the people handling the investigations and what they want us to know. Reporter: Carmen grown says she heard rosy tell a woman before the ride that her safety harness did not feel secure. The industry insists its rides are safe. The chance of being killed, 1 in 750 million. Today, six flags said it would not speculate on what caused the death. With no independent investigation, the company is essentially investigating itself.

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Mother Falls to Death From Amusement Park Ride

Children, passengers watch in horror as mother falls off 14-story high roller coaster.

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